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7.2
Faults with indication
WARNING
Risk to life from electric shock!
Touching live electrical parts can cause an electric shock.
▶ Before working on electrical parts, disconnect all phases of the
power supply (fuse/circuit breaker) and lock the isolator switch to
prevent unintentional reconnection.
If a fault occurs during operation, the LEDs flash for an extended period
or an error code is displayed (e.g. EH 02).
If a fault is present for more than 10 minutes:
▶ Briefly interrupt the power supply and switch the indoor unit back on.
If a fault persists:
▶ Call customer service and provide the fault code and details of the
appliance.
Fault code
EC 07
EC 51
EC 52
EC 53
EC 54
EC 56
EH 0A / EH 00
EH 0b
EH 02
EH 03
EH 60
EH 61
EL 0C
EL 01
PC 00
PC 01
PC 02
PC 03
PC 08
1)
PC 40
2)
EH 0E
2)
EC 0d
- -
Table 67 Faults with indication
1) this error code is not valid in AC166i... MS 4C type.
2) these error codes are only valid in AC166i... MS 4C type.
Logacool AC ... MS – 6721852539 (2025/04)
Possible cause
Fan speed of outdoor unit outside the normal range
Faulty parameter in the EEPROM of the outdoor unit
Temperature sensor error at T3 (condenser coil)
Temperature sensor error at T4 (outside temperature)
Temperature sensor error at TP (compressor discharge pipe)
Temperature sensor error at T2B (outlet of evaporator coil; only multi-split air conditioner)
Faulty parameter in the EEPROM of the indoor unit
Communication error between main PCB of indoor unit and display
Fault when detecting the zero-crossing signal
Fan speed of indoor unit outside the normal range
Temperature sensor error at T1 (room temperature)
Temperature sensor error at T2 (centre of evaporator coil)
Insufficient or escaping refrigerant or temperature sensor error at T2
Communication error between IDU and ODU
Fault at IPM module or IGBT overcurrent protection
Over - or undervoltage protection
Temperature protection at compressor or overheating protection at IPM module or pressure relief device
Low pressure protection
Inverter compressor module error
Communication fault between main PCB of outdoor unit and main PCB of compressor drive
Malfunction of the water level alarm
Malfunction of outdoor unit
Conflicting operating mode of indoor units; operating mode of indoor units and outdoor unit must correspond
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Troubleshooting
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